diff --git a/src/main/java/com/pahimar/ee3/api/RecipeMapping.java b/src/main/java/com/pahimar/ee3/api/RecipeMapping.java
index fe9485cf..b61edcd5 100644
--- a/src/main/java/com/pahimar/ee3/api/RecipeMapping.java
+++ b/src/main/java/com/pahimar/ee3/api/RecipeMapping.java
@@ -34,16 +34,14 @@ public class RecipeMapping implements JsonSerializer<RecipeMapping>, JsonDeseria
             {
                 wrappedStacks.add(wrappedStack);
             }
+            else
+            {
+                LogHelper.warning(String.format("RecipeMapping with output: %s is containing a null WrappedStack " +
+                        "input that will not be added to the input list.", outputWrappedStack.toString()));
+            }
         }
 
-        if (inputStacks.size() == wrappedStacks.size())
-        {
-            this.inputWrappedStacks = wrappedStacks;
-        }
-        else
-        {
-            this.inputWrappedStacks = null;
-        }
+        this.inputWrappedStacks = wrappedStacks;
     }
 
     public static RecipeMapping createFromJson(String jsonRecipeMapping)